The LM LM are adjustable 3-terminal negative volt- age regulators capable of supplying in excess of b1 5A over an output voltage range of b1 2V to . The LM/LM are adjustable 3-terminal negative volt- .. Reproduction of TI information in TI data books or data sheets is permissible only if reproduction. LM/LMN 3-Terminal Adjustable Negative Regulators. Check for semiconductor products and disclaimers thereto appears at the end of this data sheet.

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Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical. The LM is designed to compensate for these lm1377 internally, making such measures unnecessary. Accidenti come scotta questo transistor.

If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1. Wikimedia Commons has media related to LM and Voltage regulator circuits. Retrieved from ” https: Higher regulated voltages are obtained by connecting the adjustment pin to ,m137 resistive voltage divider between the output and ground.

LM137 Datasheet

Like the LM, each of the 78xx regulators is designed to adjust the output voltage until it is some fixed voltage above the adjustment pin which in this case is labelled ” ground “.


For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit. Retrieved 31 March The device can be configured to regulate the current to a load, rather than the voltage, by replacing the low-side resistor of the divider with the load itself.

The LM has three pins: The LM is a popular adjustable dataxheet linear voltage regulator. The alternative is to use a switching voltage regulator which is usually more efficient but has a larger footprint and requires a larger number of associated components. The LM relates in the same way to the fixed 79xx regulators.

LM137 Datasheet PDF

By using this site, you agree to the Terms of Use and Privacy Policy. Because some quiescent current flows from the adjustment pin of the device, an error term is added:. Failure to do this may cause the circuit to short.

However, the 78xx device’s quiescent current is substantially higher and less stable.

The LM is an adjustable analogue to lm37 popular 78xx fixed regulators. Views Read Edit View history. Linear integrated circuits Voltage regulation. Linear regulators inherently waste power, the power dissipated is the current passed multiplied by the voltage difference between input and output. Archived from the original PDF on 18 April The LM negative complement to the LM regulates voltages below, rather than above, the reference. This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components.


Archived from the original PDF on 31 March This page was last edited on 6 Julyat It was designed by Robert “Bob” Pease. From Wikipedia, the free encyclopedia.

How the adjustment pin is connected determines the output voltage as follows. The mechanism used is similar enough that a voltage divider can be used in the same way as with the LM and the output follows the datasbeet formula, using the regulator’s fixed voltage for V ref e.

LM Datasheet PDF – Texas Instruments

In packages with a heat-dissipating mounting tab, such as TOthe tab is connected internally to the output pin which may make it necessary to electrically isolate the tab or the heat sink from other parts of the application circuit.

Archived from the original on 17 December In use an Dataaheet commonly requires a heat sink to prevent the operating temperature rising too high.

The output current is that resulting from dropping dwtasheet reference voltage across the resistor. In other projects Wikimedia Commons.